Create ast/ and parsing/ subdirectories and move appropriate files

src/parsing/token.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_TOKEN_H_
-#define V8_TOKEN_H_
+#ifndef V8_PARSING_TOKEN_H_
+#define V8_PARSING_TOKEN_H_
 
 #include "src/base/logging.h"
 #include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 
 // TOKEN_LIST takes a list of 3 macros M, all of which satisfy the
 // same signature M(name, string, precedence), where name is the
 // symbolic token name, string is the corresponding syntactic symbol
@@ skipping 297 matching lines @@
  private:
   static const char* const name_[NUM_TOKENS];
   static const char* const string_[NUM_TOKENS];
   static const int8_t precedence_[NUM_TOKENS];
   static const char token_type[NUM_TOKENS];
 };
 
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_TOKEN_H_
+#endif  // V8_PARSING_TOKEN_H_